From d8d7c5618a11076a1a56a7e3232d4e195f70b1c8 Mon Sep 17 00:00:00 2001
From: Simon Julier <s.julier@ucl.ac.uk>
Date: Thu, 19 Jan 2017 01:49:12 +0000
Subject: [PATCH] Generate an error and exit if trying to wrap a non-const
 scalar reference.

---
 wrap/Argument.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/wrap/Argument.cpp b/wrap/Argument.cpp
index a47c6711c..6badf7794 100644
--- a/wrap/Argument.cpp
+++ b/wrap/Argument.cpp
@@ -77,6 +77,12 @@ void Argument::matlab_unwrap(FileWriter& file, const string& matlabName) const {
   string matlabUniqueType = type.qualifiedName();
   bool isNotScalar = !Argument::isScalar();
 
+  // We cannot handle scalar non const references
+  if (!isNotScalar && is_ref && !is_const) {
+    cerr << "Cannot wrap a scalar non-const reference" << endl;
+    exit(-1);
+  }
+
   if (is_ptr && type.category != Qualified::EIGEN)
     // A pointer: emit an "unwrap_shared_ptr" call which returns a pointer
     file.oss << "boost::shared_ptr<" << cppType << "> " << name